5-Keto prostaglandin Fα analogs

ABSTRACT

Prostaglandin (PG 1  derivatives having (1) a 5-keto feature, for example ##STR1## or (2) a 9-deoxy-5,9-epoxy feature together with a 4-halo or 5-hydroxy feature, for example ##STR2## or a 4,5-didehydro feature, for example in an enol ether of the formula ##STR3## said derivatives having pharmacological activity. Processes for preparing them and the appropriate intermediates are disclosed.

CROSS REFERENCE TO THE RELATED APPLICATIONS

This application is a division of Ser. No. 819,856, filed July 28, 1977, now issued as U.S. Pat. No. 4,123,441, which was a continuation-in-part of then copending application Ser. No. 725,546, filed Sept. 22, 1976, since abandoned, which was a continuation-in-part of then copending application Ser. No. 716,960, filed Aug. 23, 1976, since abandoned.

The essential material for this application, including the background of the invention, the disclosure of the invention, and the description of the preferred embodiments, including Preparations and Examples, is incorporated by reference from issued U.S. Pat. No. 4,123,441, under the provisions of M.P.E.P. 608.01(p).

BACKGROUND OF THE INVENTION

This invention relates to prostaglandin derivatives and to a process for preparing them.

The prostaglandins and analogs are well-known organic compounds derived from prostanoic acid which has the following structure and atom numbering: ##STR4##

As drawn hereinafter the formulas represent a particular optically active isomer having the same absolute configuration as PGE₁ obtained from mammalian tissues.

In the formulas, broken line attachments to the cyclopentane ring or side chain indicate substituents in alpha configuration, i.e. below the plane of the ring or side chain. Heavy solid line attachments indicate substituents in beta configuration, i.e. above the plane.

For background on prostaglandins, see for example Bergstrom, et al., Pharmacol. Rev. 20, 1 (1968). For related compounds see Pace-Asciak, et al., Biochem. 10, 3657 (1971). Related compounds are described in a publication on 6-keto-prostaglandin F₁α by Pace-Asciak, J. Am. Chem. Soc. 98, 2348 (1976) and a publication on "PGX" (6,9α-oxido-9α,15α-dihydroxyprosta-(Z)5,(E)13-dienoic acid) by E. J. Corey, et al., J. Am. Chem. Soc. 99, 20006 (1977).

Some of the compounds of this invention may be regarded as analogs of prostacyclin and prostacyclin-type compounds.

Prostacyclin, an organic compound related to prostaglandins, is (5Z)-9-deoxy-6,9α-epoxy-Δ⁵ -PGF₁ and is represented by the formula ##STR5## For its synthesis and structure see for example R. A. Johnson et al., J. Am. Chem. Soc. 99, 4182 (1977) and Prostaglandins 12, 915 (1976), and E. J. Corey, et al., cited above. For some of its biological properties and uses see the references cited in the Johnson references. Prostacyclin is referred to as "PGl₂ ", see Anonymous, Prostaglandins 13, 375 (1977).

SUMMARY OF THE INVENTION

It is the purpose of this invention to provide novel products having pharmacological activity. It is a further purpose to provide processes for preparing these products and their intermediates.

Accordingly, there is provided a compound of the formula: ##STR6## or a mixture comprising that compound and the enantiomer thereof wherein R₂ is ##STR7## wherein L is (1) --(CH₂)_(d) -C(R₂)₂ --

(2) --O--CH₂ --Y-- or

(3) --CH═CH--

wherein d is zero to 5, R₂ is hydrogen, methyl, or fluoro, being the same or different with the proviso that one R₂ is not methyl when the other is fluoro, and Y is a valence bond, --CH₂ -- or --(CH₂)₂ --,

wherein Q is ##STR8## wherein R₈ is hydrogen or alkyl of one to 4 carbon atoms, inclusive, wherein R₁ is

    ______________________________________                                         (1)            COOR.sub.3                                                      (2)            CH.sub.2 OH                                                     (3)            CH.sub.2 N(R.sub.9)(R.sub.18)                                   (4)                                                                                            ##STR9##                                                       (5)                                                                                            ##STR10##                                                      ______________________________________                                    

wherein R₃ is (a) hydrogen, (b) alkyl of one to 12 carbon atoms, inclusive, (c) cycloalkyl of 3 to 10 carbon atoms, inclusive, (d) aralkyl of 7 to 12 carbon atoms, inclusive, (e) phenyl, (f) phenyl substituted with one, 2, or 3 chloro or alkyl of one to 4 carbon atoms, inclusive,

    ______________________________________                                         (g)                                                                                   ##STR11##                                                               (h)                                                                                   ##STR12##                                                               (i)                                                                                   ##STR13##                                                               (j)                                                                                   ##STR14##                                                               (k)                                                                                   ##STR15##                                                               (l)                                                                                   ##STR16##                                                               (m)                                                                                   ##STR17##                                                               ______________________________________                                    

wherein R₁₀ is phenyl, p-bromophenyl, p-biphenylyl, p-nitrophenyl, p-benzamidophenyl, or 2-naphthyl, and wherein R₁₁ is hydrogen or benzoyl, or (n) a pharmacologically acceptable cation, wherein R₈ is hydrogen, methyl, or ethyl, and R₁₈ is hydrogen, alkyl of one to 4 carbon atoms, inclusive, aralkyl of 7 to 12 carbon atoms, inclusive, phenyl, or phenyl substituted with alkyl of one to 4 carbon atoms, inclusive;

wherein R₄ is

    ______________________________________                                         (1)                                                                                          ##STR18##                                                        (2)                                                                                          ##STR19##                                                        (3)                                                                                          ##STR20##                                                        ______________________________________                                    

wherein C_(g) H_(2g) is alkylene of one to 9 carbon atoms, inclusive, with one to 5 carbon atoms, inclusive, in the chain between --CR₅ R₆ -- and terminal methyl, wherein R₅ and R₆ are hydrogen, alkyl of one to 4 carbon atoms, inclusive, or fluoro, being the same or different, with the proviso that one of R₅ and R₆ is fluoro only when the other is hydrogen or fluoro and the further proviso that neither R₅ nor R₆ is fluoro when Z is oxa (--O--); wherein Z represents an oxa atom (--O--) or C_(j) H_(2j) wherein C_(j) H_(2j) is a valence bond or alkylene of one to 9 carbon atoms, inclusive, with one to 6 carbon atoms, inclusive between CR₅ R₆ -- and the phenyl ring; wherein T is alkyl of one to 4 carbon atoms, inclusive, fluoro, chloro, trifluoromethyl, or --OR₇ -- wherein R₇ is alkyl of one to 4 carbon atoms, inclusive, and s is zero, one, 2 or 3, with the proviso that not more than two T's are other than alkyl and when s is 2 or 3 the T's are either the same or different; and

wherein X is

(1) trans-CH═CH--

(2) cis-CH═CH--

(3) --C.tbd.C-- or

(4) --CH₂ CH₂ --;

including the lower alkanoates thereof.

In formula I as used herein, attachment to R₂₀ corresponds to bonds to the cyclopentane ring at the C-8, C-9, and C-12 positions following prostaglandin nomenclature, thus: ##STR21##

Within the scope of the prostaglandin derivatives described herein there are represented

    ______________________________________                                         (a)   PGF.sub.α  compounds when○R.sub.20is                               ##STR22##                                                               (b)   11β-PGF.sub.α  compounds when○R.sub.20is                      ##STR23##                                                               (c)   11-Deoxy-11-keto-PGF.sub.α  compounds when○R.sub.20is              ##STR24##                                                               (d)   11-Deoxy-11-methylene-PGF.sub.α  compounds when○R.sub.2           0is                                                                             ##STR25##                                                               (e)   11-Deoxy-PGF.sub.α  compounds when○R.sub.20is                      ##STR26##                                                               (f)   11-Deoxy-10,11-Didehydro-PGF.sub.α  compounds                            when○R.sub.20is                                                          ##STR27##                                                               (g)   11-Deoxy-11-hydroxymethyl-PGF.sub.α  compounds                           when○R.sub.20is                                                          ##STR28##                                                               ______________________________________                                    

For those compounds of formula I wherein Q is ##STR29## i.e. wherein the C-15 hydroxyl group is attached to the side chain in alpha configuration, the configuration at C-15 is identical with that of the naturally occuring prostaglandins such as PGE₁ obtained from mammalian tissues. The 15-epimer compounds are represented by formula I when Q is ##STR30## and are identified variously as "15-epi" or "15β" or "15R" by the appropriate prefix in the name. As is known in the art. "R" and "S" designations depend on the neighboring substituents. See R. S. Cahn, J. Chem. Ed. 41, 116 (1964).

A typical example of the keto compounds of formula I is represented by the formula ##STR31## named 5-keto-PGF₁α. The compound of formula V is a species of the formula-I compounds wherein R₂₀ is ##STR32## L is --(CH₂)₂ --, Q is R₁ is --COOH, R₄ is n-pentyl, and X is trans-CH═CH--. 

I claim:
 1. A compound of the formula ##STR33## wherein R₂₀ is ##STR34## wherein L is (1) --(CH₂)d-C(R₂)₂ --(2) --O--CH₂ --Y-- or (3) --CH═CH--wherein d is zero to 5, R₂ is hydrogen, methyl, or fluoro, being the same or different with the proviso that one R₂ is not methyl when the other is fluoro, and Y is a valence bond, --CH₂ --, or --(CH₂)₂ --,wherein Q is ##STR35## wherein R₈ is hydrogen or alkyl of one to 4 carbon atoms, inclusive, wherein R₃ is (a) hydrogen, (b) alkyl of one to 12 carbon atoms, inclusive, (c) cycloalkyl of 3 to 10 carbon atoms, inclusive, (d) aralkyl of 7 to 12 carbon atoms, inclusive, (e) phenyl, (f) phenyl substituted with one, 2, or 3 chloro or alkyl of one to 4 carbon atoms, inclusive, ##STR36## wherein R₁₀ is phenyl, p-bromophenyl, p-biphenylyl, p-nitrophenyl, p-benzamidophenyl, or 2-naphthyl, and wherein R₁₁ is hydrogen or benzoyl, or (n) a pharmacologically acceptable cation, wherein R₆₀ is ##STR37## wherein C_(g) H₂.sbsb.g is alkylene of one to 9 carbon atoms, inclusive, with one to 5 carbon atoms, inclusive, in the chain between --CR₅ R₆ -- and terminal methyl, wherein R₅ and R₆ are hydrogen, alkyl of one to 4 carbon atoms, inclusive, or fluoro, being the same or different, with the proviso that one of R₅ and R₆ is fluoro only when the other is hydrogen or fluoro, wherein X is (1) trans-CH═CH-- (2) cis-CH═CH-- (3) --C.tbd.C-- or (4) --CH₂ CH₂ --, andwherein wavy line (˜) indicates attachment in alpha or beta configuration.
 2. A compound according to claim 1 wherein R₂₀ is ##STR38##
 3. A compound according to claim 1 wherein R₂₀ is ##STR39##
 4. A compound according to claim 1 wherein R₂₀ is ##STR40##
 5. A compound according to claim 1 wherein R₂₀ is ##STR41##
 6. 5-Keto-11-deoxy-PGF₁α, methyl ester, a compound according to claim
 5. 7. A compound according to claim 1 wherein R₂₀ is ##STR42##
 8. A compound according to claim 1 wherein R₂₀ is ##STR43##
 9. A compound according to claim 1 wherein R₂₀ is ##STR44##
 10. A compound according to claim 9 wherein L is --(CH₂)n, n being 2, 3, or 4, wherein Q is ##STR45## wherein R₈ is limited to hydrogen, methyl, or ethyl, and wherein R₄ is n-pentyl, 1,1-dimethylpentyl, or 1,1-difluoropentyl.
 11. A compound according to claim 10 wherein X is --C.tbd.C--.
 12. A compound according to claim 10 wherein X is --CH₂ CH₂ --.
 13. 5-Keto-13,14-dihydro-PGF₁α, a compound according to claim
 12. 14. 5-Keto-13,14-dihydro-PGF₁α, methyl ester, a compound according to claim
 12. 15. 5,15-Diketo-13,14-dihydro-PGF₁α, a compound according to claim
 12. 16. A compound according to claim 10 wherein X is trans--CH═CH--.
 17. A compound according to claim 16 wherein R₃ is hydrogen, alkyl of one to 12 carbon atoms, inclusive, or a pharmacologically acceptable cation.
 18. 5-Keto-PGF₁α, a compound according to claim
 17. 19. 5-Keto-PGF₁α, methyl ester, a compound according to claim
 17. 20. 5,15-Diketo-PGF₁α, a compound according to claim
 17. 